f365db00e5
registers as volatile. Instructions that *wrote* to FP state were already marked volatile, but apparently gcc has license to move non-volatile asms past volatile asms. This broke amd64's feupdateenv at -O2 due to a WAR conflict between fnstsw and fldenv there.
225 lines
4.8 KiB
C
225 lines
4.8 KiB
C
/*-
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* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _FENV_H_
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#define _FENV_H_
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#include <sys/cdefs.h>
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#include <sys/_types.h>
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typedef struct {
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__uint32_t __control;
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__uint32_t __status;
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__uint32_t __tag;
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char __other[16];
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} fenv_t;
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typedef __uint16_t fexcept_t;
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/* Exception flags */
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#define FE_INVALID 0x01
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#define FE_DENORMAL 0x02
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#define FE_DIVBYZERO 0x04
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#define FE_OVERFLOW 0x08
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#define FE_UNDERFLOW 0x10
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#define FE_INEXACT 0x20
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#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
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FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
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/* Rounding modes */
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#define FE_TONEAREST 0x0000
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#define FE_DOWNWARD 0x0400
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#define FE_UPWARD 0x0800
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#define FE_TOWARDZERO 0x0c00
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#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
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FE_UPWARD | FE_TOWARDZERO)
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__BEGIN_DECLS
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/* Default floating-point environment */
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extern const fenv_t __fe_dfl_env;
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#define FE_DFL_ENV (&__fe_dfl_env)
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#define __fldcw(__cw) __asm __volatile("fldcw %0" : : "m" (__cw))
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#define __fldenv(__env) __asm __volatile("fldenv %0" : : "m" (__env))
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#define __fnclex() __asm __volatile("fnclex")
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#define __fnstenv(__env) __asm __volatile("fnstenv %0" : "=m" (*(__env)))
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#define __fnstcw(__cw) __asm __volatile("fnstcw %0" : "=m" (*(__cw)))
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#define __fnstsw(__sw) __asm __volatile("fnstsw %0" : "=am" (*(__sw)))
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#define __fwait() __asm __volatile("fwait")
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static __inline int
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feclearexcept(int __excepts)
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{
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fenv_t __env;
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if (__excepts == FE_ALL_EXCEPT) {
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__fnclex();
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} else {
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__fnstenv(&__env);
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__env.__status &= ~__excepts;
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__fldenv(__env);
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}
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return (0);
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}
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static __inline int
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fegetexceptflag(fexcept_t *__flagp, int __excepts)
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{
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int __status;
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__fnstsw(&__status);
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*__flagp = __status & __excepts;
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return (0);
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}
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static __inline int
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fesetexceptflag(const fexcept_t *__flagp, int __excepts)
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{
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fenv_t __env;
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__fnstenv(&__env);
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__env.__status &= ~__excepts;
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__env.__status |= *__flagp & __excepts;
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__fldenv(__env);
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return (0);
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}
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static __inline int
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feraiseexcept(int __excepts)
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{
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fexcept_t __ex = __excepts;
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fesetexceptflag(&__ex, __excepts);
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__fwait();
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return (0);
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}
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static __inline int
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fetestexcept(int __excepts)
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{
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int __status;
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__fnstsw(&__status);
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return (__status & __excepts);
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}
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static __inline int
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fegetround(void)
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{
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int __control;
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__fnstcw(&__control);
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return (__control & _ROUND_MASK);
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}
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static __inline int
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fesetround(int __round)
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{
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int __control;
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if (__round & ~_ROUND_MASK)
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return (-1);
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__fnstcw(&__control);
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__control &= ~_ROUND_MASK;
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__control |= __round;
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__fldcw(__control);
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return (0);
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}
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static __inline int
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fegetenv(fenv_t *__envp)
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{
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int __control;
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/*
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* fnstenv masks all exceptions, so we need to save and
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* restore the control word to avoid this side effect.
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*/
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__fnstcw(&__control);
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__fnstenv(__envp);
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__fldcw(__control);
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return (0);
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}
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static __inline int
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feholdexcept(fenv_t *__envp)
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{
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__fnstenv(__envp);
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__fnclex();
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return (0);
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}
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static __inline int
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fesetenv(const fenv_t *__envp)
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{
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__fldenv(*__envp);
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return (0);
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}
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static __inline int
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feupdateenv(const fenv_t *__envp)
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{
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int __status;
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__fnstsw(&__status);
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__fldenv(*__envp);
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feraiseexcept(__status & FE_ALL_EXCEPT);
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return (0);
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}
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#if __BSD_VISIBLE
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static __inline int
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fesetmask(int __mask)
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{
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int __control;
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__fnstcw(&__control);
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__mask = (__control | FE_ALL_EXCEPT) & ~__mask;
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__fldcw(__mask);
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return (~__control & FE_ALL_EXCEPT);
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}
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static __inline int
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fegetmask(void)
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{
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int __control;
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__fnstcw(&__control);
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return (~__control & FE_ALL_EXCEPT);
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}
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#endif /* __BSD_VISIBLE */
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__END_DECLS
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#endif /* !_FENV_H_ */
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